The electricitry must be at a very low voltage in order to travel across the gap and create a good spark

低压电器（Low voltage Apparatus）通常指工作在交流 ____...中起通断、控制、保护和调节作用的电气设备

For a neutral-unearthing system, during a bolted single line-to-ground fault, the non-fault phase voltage and the fault phase voltage are ()respectively. A: phase voltage and zero B: phase voltage and line-to-line voltage C: line-to-line voltage and phase voltage D: line-to-line voltage and zero

The ignition system falls into two sections: low-voltage circuit and high-voltage circuit.

In previous simulation and on-site experiment, where is the voltage difference between the source voltage and the load voltage?

The voltage meter and current meter on the main switchboard shows ( <br/>). A: phase voltage and phase current of generator B: line voltage and line current of generator C: line voltage and line current of crane D: line voltage and line current of shore power

There are two identical batteries in series, which statement is true?( ) A: The total voltage equals the sum of the voltages of each battery. B: The total voltage equals any battery voltage. C: The total voltage equals half of one battery voltage

In binary positive logic systems，1 is represented by the voltage, and is represented by the lower voltage level.

The<br/>common-base amplifier has _()()()__. A: voltage gain, current gain, and power gain B: voltage gain and power gain, but no current gain C: current gain and power gain, but no voltage gain D: current gain and voltage gain, but no power gain

When the input voltage to this circuit is 0.25 V, the output voltage is （     ）.[img=330x151]17a3dde427a4d5d.png[/img]